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Home -> Community -> Mailing Lists -> Oracle-L -> RE: quickest method
I agree, but SqlLoader can also take ages to do the set up, and by the time
you have finished the set up and fixed all the error codes etc, the Import
would have finished.
If its millions of records, SqlLoader is the way to go, but if it's a
smallish table, Import - without a doubt.
Or even using a create table as select * from tablename_at_dblink works great if it's a smallish table without any constraints.
Just my 2 cents worth.
-----Original Message-----
Sent: 15 May 2003 02:00
To: Multiple recipients of list ORACLE-L
Also Carol,
I agree with Jared - my experiences have almost always shown SQL Loader as the fastest way to go when the conditions are right. Obviously there are lots of variables which determine speed (hardware platform, CPU speed, record length, the list goes on) but I have frequently had SQL Loader in the 1+ million records per minute speed range with very little work on my behalf.
When looking into SQL Loader there are a few things which can have a big impact on performance:
Regards,
Mark.
Jared.Still_at_radis
ys.com To: Multiple recipients
of list ORACLE-L <ORACLE-L_at_fatcity.com>
Sent by: cc:
root_at_fatcity.com Subject: Re: quickest method
15/05/2003 09:01
Please respond to
ORACLE-L
Carol,
Hands down, SQL Loader is the fastest.
Export/Import is rather slow.
SQL and PL/SQL commands can be on either side of exp/imp, depending on what you are doing and how well the code is written.
e.g. SQL statements are fairly fast, PL/SQL for loops are not. Pl/SQL
bulk
processing is fast.
Unless you need the programatic abilities of PL/SQL, use SQL Loader.
Exp/Imp can still be useful, even with SQL Loader. Use exp/imp to build your tables, then the indexes and constraints after the data is loader.
No pat answer as to how to load data, depends on your requirements.
There's probably no point in messing with SQL Loader if the data sets are small, and you can easily export from another database and then import.
If the data is in CSV or flat files though, and/or is very large, SQL
Loader
is very fast.
HTH Jared
"Carol Legros" <carol_legros_at_hotmail.com>
Sent by: root_at_fatcity.com
05/14/2003 02:57 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
cc:
Subject: quickest method
I'm curious to know whether anyone out there has seen a comparison
discussing the pros and cons and/or results of any simulation tests that
compare the speed with which data can be loaded into a target database
from
a source (database or flat file) using the following 3 methods :
(i) Export (from source), Import (to target)
(ii) SQL*Loader (to target)
(iii) SQL or PL/SQL commands (insert to target)
using a Database Link between source &
target
I'm working on a data loading strategy and since there are "many ways to skin a cat", I'm considering these as options. Of course, there are other
criteria that impact the method chosen, but assuming all things are equal
(ie network bandwidth is good, access to both source and target are not an
issue etc.), which of these methods would be quickest ?
Thanks,
Carol
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Carol Legros INET: carol_legros_at_hotmail.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-LReceived on Thu May 15 2003 - 03:16:38 CDT
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